Hi Rahul,
please see Vladimir's orginal reply:
Go to Help > About Eclipse > Installation Details. There should be "SAP HANA Cloud Platform Tools for Connecting to SAP HANA Systems".
You wrote that you installed the "SAP Hana Development Tools".
There are two plugins: the "SAP HANA Tools", which only contains the "basic" HANA Studio functionality and the "SAP HANA Cloud Platform Tools", which adds the capability to connect to the cloud systems. You need both!
Best regards,
Oliver